Ok, last time, I got a lot of questions emailed to me about missing dimensions, so ill explain a couple things about general dimensioning and tolerancing standard practices.
To keep the clutter of the drawing to a minimum, features tend to be only dimensioned once. Some views will show certain dimensions. The same dimension isn't typically repeated in a different view.
For example: If view A shows a cubes length, width and height, view B won't show the length width and height.
Some dimensions are inferred, again to reduce clutter.
For example:In a drawing of a circle centered within a square, The dimensions are from a specific datum (point from which everything is measured). If the datum is the lower left corner of the square, then the dimensions will show the distance from the lower left corner to the top left corner, it will show the distance from the lower left corner to the lower right corner, it will show the distance from the lower left corner to the circle center along the X axis (bottom edge of the square) and it will show the distance from the lower left corner to the circle center along the Y axis (left edge of the square). It will also show the diameter of the circle.
(important: In the above example, if you need/want the distance from the circle center to any other point on the drawing, it is common practice to break out a calculator and calculate that information using the information in the drawing)
The distance from part edges to hole edges are not typically given, rather the distance from part edge to hole center is given. It is expected that if the machinist interpreting the engineering drawing need such a measurement, he will take the distance from the part edge to the circle center, and subtract half the diameter (radius) of the hole.
Symetric features are typically only dimensioned once.
Example: in the above circle in a square example. If the corners of the square are radiused, the radii of all for corners will be shown on one corner only. If any of the corners were meant to have a different radius, that specific corner will have its own seperate dimension.
That's why nerds always carry calculator!
The Adobe .pdf drawings are up on Grabcad.com:
https://grabcad.com/library/ram-sport-express-tow-hook-brackets-1
